[GIT SERIES v2] secnet: fuzz test slip decoder, fd handling fixes

[Ian Jackson]

Ian Jackson writes ("[GIT SERIES v2] secnet: fuzz test slip decoder, fd handling fixes"):
> The following series is available for review here:
>   http://www.chiark.greenend.org.uk/ucgi/~ian/git/secnet.git/
>   git://git.chiark.greenend.org.uk/~ian/secnet.git
> in the following rev-list:
>   base.fuzz-slip-decoder.2..proposed.fuzz-slip-decoder.2

These tags are also now known as
    base.fuzz-slip-decoder.v2..proposed.fuzz-slip-decoder.v2
(I have been developing my message generator script)

Also the commit list was backwards.  Here it is ancestors-first:

  ccf2502  fds: Provide cloexec() and use it in udp.c and tun.c
  cab110d  fds: Simplify fd close condition in tun_set_route
  845e3f4  fds: Introduce pipe_cloexec()
  6ab18f5  slip: Do not malloc the userv activation context etc.
  23a1ba6  test-example: Provide a fuzzer for the slip decoder

Ian.